@Override
protected String doInBackground(Tag... params) {
Tag tag = params[0];
Ndef ndef = Ndef.get(tag);
if (ndef == null) {
// NDEF is not supported by this Tag.
return null;
}
NdefMessage ndefMessage = ndef.getCachedNdefMessage();
NdefRecord[] records = ndefMessage.getRecords();
for (NdefRecord ndefRecord : records) {
if (ndefRecord.getTnf() == NdefRecord.TNF_WELL_KNOWN
&& Arrays.equals(ndefRecord.getType(), NdefRecord.RTD_TEXT)) {
try {
return readText(ndefRecord);
} catch (UnsupportedEncodingException e) {
Log.e(TAG, "Unsupported Encoding", e);
}
}
}
return null;
}
boolean writeTag(NdefMessage message, NdefMessage messageWithoutPhoto, Tag tag) {
try {
Ndef ndef = Ndef.get(tag);
if (ndef != null) {
return writeToTag(message, messageWithoutPhoto, ndef);
} else {
NdefFormatable format = NdefFormatable.get(tag);
if (format != null) {
if (formatAndWrite(format, message) || formatAndWrite(format, messageWithoutPhoto)) {
return true;
} else {
toast(getString(R.string.write_tag_failed_format));
return false;
}
} else {
toast(getString(R.string.write_tag_failed_ndef));
return false;
}
}
} catch (Exception e) {
toast(getString(R.string.write_tag_failed));
}
return false;
}
private void readTag(Tag t) {
// get NDEF tag details
Ndef ndefTag = Ndef.get(t);
// get NDEF message details
NdefMessage ndefMesg = ndefTag.getCachedNdefMessage();
if (ndefMesg == null) {
return;
}
NdefRecord[] ndefRecords = ndefMesg.getRecords();
if (ndefRecords == null) {
return;
}
for (NdefRecord record : ndefRecords) {
short tnf = record.getTnf();
String type = new String(record.getType());
if (tnf == NdefRecord.TNF_WELL_KNOWN && Arrays.equals(type.getBytes(), NdefRecord.RTD_URI)) {
String url = new String(record.getPayload());
if (url.startsWith(ATTENDEE_URL_PREFIX)) {
Intent i = new Intent(Intent.ACTION_VIEW);
i.setData(Uri.parse("https://" + url.substring(1)));
startActivity(i);
return;
}
}
}
}
public static NdefRecord[] readRecords(Tag tag)
throws IOException, FormatException, NotReadableException {
Ndef ndefTag = Ndef.get(tag);
if (ndefTag == null) {
throw new NotReadableException("The tag doesn't support Ndef tech");
}
ndefTag.connect();
NdefMessage message = ndefTag.getNdefMessage();
NdefRecord[] records = message.getRecords();
ndefTag.close();
return records;
}
private void write(String text, Tag tag) throws IOException, FormatException {
NdefRecord[] records = {createWellKnownRecord(text)};
NdefMessage message = new NdefMessage(records);
// Get an instance of Ndef for the tag.
Ndef ndef = Ndef.get(tag);
// Enable I/O
ndef.connect();
// Write the message
ndef.writeNdefMessage(message);
// Close the connection
ndef.close();
}
/** Metoda zapisujaca w tle wiadomosc do tagu NFC Przed sprawdzeniem formatuje tag */
@Override
protected Void doInBackground(Void... nop) {
int size = this.msg.toByteArray().length;
try {
Ndef ndef = Ndef.get(this.tag);
if (ndef == null) {
NdefFormatable formatable = NdefFormatable.get(this.tag);
if (formatable != null) {
try {
formatable.connect();
try {
formatable.format(this.msg);
} catch (Exception e) {
this.returnText = R.string.nfc_tag_refused_to_format;
}
} catch (Exception e) {
this.returnText = R.string.nfc_tag_refused_to_connect;
} finally {
formatable.close();
}
} else {
this.returnText = R.string.nfc_tag_does_not_support_ndef;
}
} else {
ndef.connect();
try {
if (!ndef.isWritable()) {
this.returnText = R.string.nfc_tag_is_read_only;
} else if (ndef.getMaxSize() < size) {
this.returnText = R.string.nfc_message_is_too_big;
} else {
ndef.writeNdefMessage(this.msg);
this.returnText = R.string.nfc_tag_saved;
this.returnStatus = Activity.RESULT_OK;
}
} catch (Exception e) {
this.returnText = R.string.nfc_tag_refused_to_connect;
} finally {
ndef.close();
}
}
} catch (Exception e) {
Log.e(TAG, "Exception when writing tag", e);
this.returnText = R.string.nfc_general_exception;
}
return (null);
}
public boolean writeNdefMessageToTag(NdefMessage message, Tag detectedTag) {
int size = message.toByteArray().length;
try {
Ndef ndef = Ndef.get(detectedTag);
if (ndef != null) {
ndef.connect();
if (!ndef.isWritable()) {
Toast.makeText(this, "Tag is read-only.", Toast.LENGTH_SHORT).show();
return false;
}
if (ndef.getMaxSize() < size) {
Toast.makeText(
this,
"The data cannot written to tag,Tag capacity is "
+ ndef.getMaxSize()
+ " bytes, message is "
+ size
+ " bytes.",
Toast.LENGTH_SHORT)
.show();
return false;
}
ndef.writeNdefMessage(message);
ndef.close();
Toast.makeText(this, "Message is written tag.", Toast.LENGTH_SHORT).show();
return true;
} else {
NdefFormatable ndefFormat = NdefFormatable.get(detectedTag);
if (ndefFormat != null) {
try {
ndefFormat.connect();
ndefFormat.format(message);
ndefFormat.close();
Toast.makeText(this, "The data is written to the tag ", Toast.LENGTH_SHORT).show();
return true;
} catch (IOException e) {
Toast.makeText(this, "Failed to format tag", Toast.LENGTH_SHORT).show();
return false;
}
} else {
Toast.makeText(this, "NDEF is not supported", Toast.LENGTH_SHORT).show();
return false;
}
}
} catch (Exception e) {
Toast.makeText(this, "Write opreation is failed", Toast.LENGTH_SHORT).show();
}
return false;
}
public void writeTag(NdefMessage message, Tag tag) {
int size = message.toByteArray().length;
String mess;
try {
Ndef ndef = Ndef.get(tag);
if (ndef != null) {
ndef.connect();
if (!ndef.isWritable()) {
this.status = 0;
this.message = "Tag is read-only";
}
if (ndef.getMaxSize() < size) {
mess = "Tag capacity is " + ndef.getMaxSize() + " bytes, message is " + size + " bytes.";
this.status = 0;
this.message = mess;
}
ndef.writeNdefMessage(message);
if (writeProtect) ndef.makeReadOnly();
mess = "Wrote message to pre-formatted tag.";
this.status = 1;
this.message = mess;
} else {
NdefFormatable format = NdefFormatable.get(tag);
if (format != null) {
try {
format.connect();
format.format(message);
mess = "Formatted tag and wrote message";
this.status = 1;
this.message = mess;
} catch (IOException e) {
mess = "Failed to format tag.";
this.status = 0;
this.message = mess;
}
} else {
mess = "Tag doesn't support NDEF.";
this.status = 0;
this.message = mess;
}
}
} catch (Exception e) {
mess = "Failed to write tag";
this.status = 0;
this.message = mess;
}
}
public static String[] readStrings(Tag tag)
throws IOException, FormatException, NotReadableException {
Ndef ndefTag = Ndef.get(tag);
if (ndefTag == null) {
throw new NotReadableException("The tag doesn't support Ndef tech");
}
ndefTag.connect();
NdefMessage message = ndefTag.getNdefMessage();
NdefRecord[] records = message.getRecords();
String[] out = new String[records.length];
int i = 0;
for (NdefRecord rec : records) {
out[i++] = new String(rec.getPayload(), Charset.forName("UTF-8"));
}
ndefTag.close();
return out;
}
/**
* タグ書き込みを行う
*
* @param message
* @param tag
* @return
*/
boolean writeTag(NdefMessage message, Tag tag) {
int size = message.toByteArray().length;
try {
Ndef ndef = Ndef.get(tag);
if (ndef != null) {
ndef.connect();
if (!ndef.isWritable()) {
toast("Tag is read-only.");
return false;
}
if (ndef.getMaxSize() < size) {
toast("Tag capacity is " + ndef.getMaxSize() + " bytes, message is " + size + " bytes.");
return false;
}
ndef.writeNdefMessage(message);
mVib.vibrate(300);
toast("Wrote message to pre-formatted tag.");
return true;
} else {
NdefFormatable format = NdefFormatable.get(tag);
if (format != null) {
try {
format.connect();
format.format(message);
mVib.vibrate(300);
toast("Formatted tag and wrote message");
return true;
} catch (IOException e) {
toast("Failed to format tag.");
return false;
}
} else {
toast("Tag doesn't support NDEF.");
return false;
}
}
} catch (Exception e) {
e.printStackTrace();
toast("Failed to write tag");
}
return false;
}
// El método write es el más importante, será el que se encargue de crear el mensaje
// y escribirlo en nuestro tag.
private void write(String text, Tag tag) throws IOException, FormatException {
try {
// Creamos un array de elementos NdefRecord. Este Objeto representa un registro del mensaje
// NDEF
// Para crear el objeto NdefRecord usamos el método createRecord(String s)
NdefRecord[] records = {createRecord(text)};
// NdefMessage encapsula un mensaje Ndef(NFC Data Exchange Format). Estos mensajes están
// compuestos por varios registros encapsulados por la clase NdefRecord
NdefMessage message = new NdefMessage(records);
// Obtenemos una instancia de Ndef del Tag
Ndef ndef = Ndef.get(tag);
ndef.connect();
ndef.writeNdefMessage(message);
ndef.close();
} catch (Exception e) {
Log.d("WRITE", "Excepción: " + e.getMessage());
}
} // write
private void connectToNDEF(Tag tag) {
Ndef ndef = Ndef.get(tag);
try {
receiveTab.append("\n" + ndef.getType());
NdefMessage message = ndef.getCachedNdefMessage();
if (message != null) {
NdefRecord[] recordsFromMessage = message.getRecords();
for (int i = 0; i < recordsFromMessage.length; i++) {
printMessage(recordsFromMessage[i]);
}
} else {
receiveTab.append("\nNull message");
}
receiveTab.append("\nNDEF did work!");
} catch (Exception ex) {
receiveTab.append("\nNDEF did not work");
}
}
public boolean writableTag(Tag tag, Context context) {
try {
Ndef ndef = Ndef.get(tag);
if (ndef != null) {
ndef.connect();
if (!ndef.isWritable()) {
Toast.makeText(context, "Tag is read-only.", Toast.LENGTH_SHORT).show();
ndef.close();
return false;
}
ndef.close();
return true;
}
} catch (Exception e) {
Toast.makeText(context, "Failed to read tag", Toast.LENGTH_SHORT).show();
}
return false;
}
private boolean writeTxtToTag(String textToWrite, Tag tag) throws IOException, FormatException {
if (tag == null) {
Log.d(TAG, "writeTxtToTag: tag is null!");
Toast.makeText(this, "Tag is null", Toast.LENGTH_SHORT).show();
return false;
}
NdefRecord record = createRecord(textToWrite);
if (record == null) {
Log.d(TAG, "writeTxtToTag: record is null!");
return false;
} else {
NdefRecord[] records = {record};
NdefMessage message = new NdefMessage(records);
Ndef ndef = Ndef.get(tag);
ndef.connect();
ndef.writeNdefMessage(message);
ndef.close();
}
return true;
}
public void writeTag(NdefMessage ndefMessage, Tag tag) {
try {
Ndef ndef = Ndef.get(tag);
if (ndef != null) {
ndef.connect();
ndef.writeNdefMessage(ndefMessage);
} else {
NdefFormatable format = NdefFormatable.get(tag);
if (format != null) {
try {
format.connect();
format.format(ndefMessage);
} catch (IOException e) {
Log.e(Constants.LOGTAG, e.getMessage(), e);
}
}
}
} catch (Exception e) {
Log.e(Constants.LOGTAG, e.getMessage(), e);
}
}
/** Actually writes data into tag (sticker). */
private void writeTag(NdefMessage message, Tag tag) {
int size = message.toByteArray().length;
try {
Ndef ndef = Ndef.get(tag);
if (ndef != null) {
ndef.connect();
if (!ndef.isWritable()) {
toast(R.string.tag_read_only);
return;
}
if (ndef.getMaxSize() < size) {
toast(R.string.exceeded_tag_capacity);
return;
}
ndef.writeNdefMessage(message);
toast(R.string.sticker_write_success);
} else {
NdefFormatable format = NdefFormatable.get(tag);
if (format != null) {
try {
format.connect();
format.format(message);
toast(R.string.sticker_write_success);
} catch (IOException e) {
toast(R.string.sticker_write_error);
}
} else {
toast(R.string.sticker_write_error);
}
}
} catch (FormatException e) {
toast(R.string.sticker_write_error);
} catch (IOException e) {
toast(R.string.sticker_write_error);
}
}
@Override
protected void onNewIntent(Intent intent) {
// if extra is present, it has priority on the saved poll
Poll serializedPoll = (Poll) intent.getSerializableExtra("poll");
if (serializedPoll != null) {
poll = serializedPoll;
}
if (intent.getParcelableExtra(NfcAdapter.EXTRA_TAG) != null) {
Intent broadcastIntent = new Intent(BroadcastIntentTypes.nfcTagTapped);
broadcastIntent.putExtra(
NfcAdapter.EXTRA_TAG, intent.getParcelableExtra(NfcAdapter.EXTRA_TAG));
LocalBroadcastManager.getInstance(this).sendBroadcast(broadcastIntent);
}
Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
Ndef ndef = Ndef.get(tag);
if (ndef == null) {
Toast.makeText(
this, getResources().getText(R.string.toast_nfc_tag_read_failed), Toast.LENGTH_LONG)
.show();
} else {
NdefMessage msg;
msg = ndef.getCachedNdefMessage();
config = new String(msg.getRecords()[0].getPayload()).split("\\|\\|");
// saving the values that we got
SharedPreferences.Editor editor = preferences.edit();
editor.putString("SSID", ssid);
editor.commit();
if (checkIdentification()) {
connect(config, this);
}
}
super.onNewIntent(intent);
}
@Override
protected void onResume() {
// initialising
super.onResume();
textView.setText("LOADING...");
// Checks whether the app was started by:
// - reading a tag (which means we should communicate with the database and change phone
// settings)
// - the user (which means the welcome info and settings activity should start)
Intent intent = this.getIntent();
if (intent.getAction().contains("NDEF")) {
// raw message from tag
Parcelable[] rawMsgs = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
if (rawMsgs != null) {
// The tag
Tag tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
// its records
NdefRecord[] records = Ndef.get(tag).getCachedNdefMessage().getRecords();
// the info on it in byte shape
byte[] payload = records[0].getPayload();
// Get the Text Encoding
String textEncoding;
if ((payload[0] & 128) == 0) textEncoding = "UTF-8";
else textEncoding = "UTF-16";
// Get the Language Code
int languageCodeLength = payload[0] & 0063;
try {
// the configured message on the tag (the id of the room in which it is put)
String roomID =
new String(
payload,
languageCodeLength + 1,
payload.length - languageCodeLength - 1,
textEncoding);
// the class which communicates with the sql database
DatabaseConnecter sql = new DatabaseConnecter(MainActivity.this);
// the id of the module which is currently on schedule
int moduleID = sql.getModule(Integer.parseInt(roomID));
if (moduleID == 0) {
AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setMessage("There is no lecture at this time in this room!").setTitle("Alert!");
builder.setPositiveButton(
"Ok",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
// User clicked OK button
MainActivity.this.finish();
}
});
AlertDialog dialog = builder.create();
dialog.show();
}
// a welcome message on screen
textView.setText(
"The current lecture is "
+ sql.getModuleName(moduleID)
+ "! Your lecturer is "
+ sql.getLecturerName(moduleID));
// tells the server that the student scanned the tag (went in the lecture or went out)
sql.setPurpose(studentID);
// gets the link for the lecture notes and enables the button to browse them
if (sql.getPurpose(studentID).equals("out")) {
lecnoteButton.setVisibility(Button.INVISIBLE);
lecnoteButton.setEnabled(false);
surveyButton.setVisibility(Button.VISIBLE);
surveyButton.setEnabled(true);
} else {
lecnoteButton.setVisibility(Button.VISIBLE);
lecnoteButton.setEnabled(true);
surveyButton.setVisibility(Button.INVISIBLE);
surveyButton.setEnabled(false);
}
link = sql.getLecnotes(moduleID);
if (link.equals("None")) lecnoteButton.setText("No lecture notes available!");
else lecnoteButton.setEnabled(true);
surveyLink = sql.getSurvey(moduleID);
if (surveyLink.equals("None")) surveyButton.setText("No lecture notes available!");
else surveyButton.setEnabled(true);
}
// should not happen if the tag is configured properly
catch (UnsupportedEncodingException e) {
System.out.println("invalid tag " + e.toString());
} catch (NumberFormatException e) {
System.out.println("invalid tag " + e.toString());
}
}
} // end of if
else {
// starts the settings activity
Intent configIntent = new Intent(MainActivity.this, ConfigActivity.class);
startActivity(configIntent);
}
}
boolean writeTag(NdefMessage message, Tag tag) {
int size = message.toByteArray().length;
try {
Ndef ndef = Ndef.get(tag);
if (ndef != null) {
ndef.connect();
if (!ndef.isWritable()) {
Toast.makeText(
this, "Cannot write to this tag. This tag is read-only.", Toast.LENGTH_LONG)
.show();
return false;
}
if (ndef.getMaxSize() < size) {
Toast.makeText(
this,
"Cannot write to this tag. Message size ("
+ size
+ " bytes) exceeds this tag's capacity of "
+ ndef.getMaxSize()
+ " bytes.",
Toast.LENGTH_LONG)
.show();
return false;
}
ndef.writeNdefMessage(message);
Toast.makeText(this, "A pre-formatted tag was successfully updated.", Toast.LENGTH_LONG)
.show();
return true;
} else {
NdefFormatable format = NdefFormatable.get(tag);
if (format != null) {
try {
format.connect();
format.format(message);
Toast.makeText(
this, "This tag was successfully formatted and updated.", Toast.LENGTH_LONG)
.show();
return true;
} catch (IOException e) {
Toast.makeText(
this, "Cannot write to this tag due to I/O Exception.", Toast.LENGTH_LONG)
.show();
return false;
}
} else {
Toast.makeText(
this,
"Cannot write to this tag. This tag does not support NDEF.",
Toast.LENGTH_LONG)
.show();
return false;
}
}
} catch (Exception e) {
Toast.makeText(this, "Cannot write to this tag due to an Exception.", Toast.LENGTH_LONG)
.show();
}
return false;
}